GetRootNodes Method—ArcGIS Pro

GetRootNodes Method

In This Topic

Gets the set of root nodes as a MapMemberIDSet. This method must be called on the MCT. Use QueuedTask.Run.

Syntax

C#
Visual Basic (Declaration)

public static MapMemberIDSet GetRootNodes( 
   MapView mapView
)

Public Shared Function GetRootNodes( _
   ByVal mapView As MapView _
) As MapMemberIDSet

Parameters

mapView

Exceptions

Exception	Description
System.ArgumentNullException	Map cannot be null.
System.ArgumentException	Map is not a link chart.
ArcGIS.Core.CalledOnWrongThreadException	This method or property must be called within the lambda passed to QueuedTask.Run.

Example

Get records that are set as Root Nodes

await QueuedTask.Run(() =>
{
  MapMemberIDSet rootNodes = MapView.Active.GetRootNodes();
  var rootNodeDict = rootNodes.ToDictionary();

  // rootNodeDict is a Dictionary<MapMember, List<long>>

  // access a particular mapMember in the Dictionary
  if (rootNodeDict.ContainsKey(mapMember))
  {
    var oids = rootNodeDict[mapMember];
  }

  // OR iterate through the dictionary
  foreach (var (mm, oids) in rootNodeDict)
  {
    // do something
  }
});

Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3.4 or higher.

Reference

KnowledgeGraphMappingExtensions Class
KnowledgeGraphMappingExtensions Members

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